Focus detecting system

Details Focus detecting system Focus detecting system

1987-06-24

1989-07-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354405, G01J 120

Patent

active

048453536

ABSTRACT:
A focus detecting system of a type comprising a transducer element array arranged in a vertical direction for detecting through a reflecting member a standard light flux and a reference light fluxes which have passed through different areas of a plane of an exit pupil of the photo-taking lens. The reflecting member is supported for pivotal movement between a downwardly pivoted position at which both of the standard and reference light fluxes are reflected downwards, and an upwardly pivoted position at which it is retracted out of the optical axis. The reflecting member when in the downwardly pivoted position causes the standard light flux to be reflected at a first reflecting surface area of the reflecting member adjacent the pivot axis and also causes the reference light flux to be reflected at a second reflecting surface area of the reflecting member remote from the pivot axis.

REFERENCES:
patent: 3529528 (1970-09-01), Leitz
patent: 3708619 (1973-01-01), Martin
patent: 3860935 (1975-01-01), Stauffer
patent: 4293205 (1982-10-01), Tokutomi et al.
patent: 4431285 (1984-02-01), Kajita et al.
patent: 4580042 (1986-04-01), Tokutomi et al.
patent: 4636624 (1987-01-01), Ishida et al.
patent: 4660955 (1987-04-01), Ishida et al.
patent: 4721975 (1988-01-01), Hamada

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